MOV     AL,30H          ;location 30H of CMOS RAM
	OUT 	70H,AL		;to be accessed
	IN 		AL,71H		;read its contents
	MOV 	CL,AL		;save it in CL
	MOV	AL,31H		;location 31H of CMOS RAM
	OUT 	70H,AL		;to be accessed
	IN 		AL,71H		;read its contents
	MOV 	CH,AL		;save it in CH 
;now CX has the size of memory above 1MB (extended memory) 
;installed in this PC,the size is in K bytes